Stuff you might want to add on at the end:
*If our current understanding is correct* the universe is expanding exponentially. Should this continue into the future, it's possible that the universe's hubble radius will shrink to an infinitely small size. (The hubble radius is the distance from an observer in which distant objects appear to be moving away at the speed of light)
Essentially, all physical structure will be ripped apart by the universe's expansion.
http://en.wikipedia.org/wiki/Big_Rip